18897319371 has 12 divisors (see below), whose sum is σ = 29310128232. Its totient is φ = 10798468128.

The previous prime is 18897319369. The next prime is 18897319373. The reversal of 18897319371 is 17391379881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18897319369) and next prime (18897319373).

It is not a de Polignac number, because 18897319371 - 2¹ = 18897319369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18897319373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64276450 + ... + 64276743.

It is an arithmetic number, because the mean of its divisors is an integer number (2442510686).

Almost surely, 2^18897319371 is an apocalyptic number.

18897319371 is a deficient number, since it is larger than the sum of its proper divisors (10412808861).

18897319371 is a wasteful number, since it uses less digits than its factorization.

18897319371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128553210 (or 128553203 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 57.

The spelling of 18897319371 in words is "eighteen billion, eight hundred ninety-seven million, three hundred nineteen thousand, three hundred seventy-one".